Change "Screen Mode" to "Orientation"

Screen mode isn't user-oriented. Orientation is.

"Page" in "Page Margin" is redundant
Merge pull request #1278 from Frenzie/language

Change "Screen Mode" to "Orientation"
fix a case when "ip r" command fails

our network manager script isn't the beauty of the code base.
However, this fixes a case where it would crash the reader when an
external command fails.

fixes #1279.